Spraying apparatus

ABSTRACT

A spraying apparatus especially an apparatus portable on the back of a person, with a motor driven blower connected to a delivery pipe and with an active agent receiving tank connected to said delivery pipe, in which an oscillating burner resonator has its cooling means for purposes of generating a mist detachably connected to the blower, said cooling means including a cover surrounding said oscillating burner resonator.

United States Paten [1 1 Bauder et a1.

, [111 3,758,036 451 Sept l1, 1973 SPRAYING APPARATUS [75] lnventors: Herbert Baurler, Grossholzleute;

Otto Locher, Isny/Allgau, both of Germany 1 Assigneer Heine Gza ehaeqe s sbe im beschrankter Battling l s nylAllgau, Germany [22] Filed: Dec. 23, 1970 [21] App]. No.2 100,869

[30] Foreign Application Priority Data Dec. 24, 1969 Germany P 19 64 907.1

52 05.01 ..239/102,239/135,239/154 51 V ..B05b3/l4 5s FieldofSearch ..239/1o1,102,152,

v [56] References Cited UNITED STATES PATENTS 6/1966 Lang 239/102 3,575,349 4/1971 Stahl ..239/135 3,275,059 9/1966 McCullough 239/102 X 3,374,953 3/1968 Bodine 3,326,538 6/1967 Merritt 2,958,155 11/1960 Emmerich 3,223,286 12/1965 Sawyer 3,539,110 11/1970 Kobayashi 239/152 Primary Examiner-Lloyd L. King AttameyWa1ter Becker [57] ABSTRACT 20 Claims, 8 Drawing Figures 8 22 1 V N15 4 9 I3 11' 2,

Pmaminsmfl I 3,758,036 7 sum 2 0F 8 In ventargi PATENTEDSEPUIBYB v 3,750,036

SHEEI BF 8 Fig. 4

In ventors PATENTEDSEPI 11ers SHEET 8 OF 8 SPRAYING APPARATUS This invention relates to spraying apparatus, particu larly spraying apparatus which can be transported on a persons back, having a motor driven blower connected to a delivery pipe, and a container for an active agent also connected to the delivery pipe.

The invention is based on the problem of constructing a spraying apparatus of this kind such that, in use, the blast air current for the blower is in an advantageous manner also suitable for the production of a mist.

This is attained in a spraying apparatus of the aforementioned kind according to the invention in that for the production of the mist there is provided an oscillating burner resonator and cooling apparatus therefor exchangeably connected to the blower. Thereby, in use, a very effective cooling of the apparatus is obtained so that the apparatus has a high degree of efficiency, and can be carried during use without danger.

In one embodiment, which is easy to handle, the cooling apparatus is formed by a cover which surment, directly afterthe combustion chamber of the burner, a low pressure zone is provided whereby the cross-section of the active agent mist current is widrounds the oscillating burner resonator, and which is preferably axially parallel to such resonator, so that the resonator is cooled almost uniformly over its whole periphery and the apparatus can be held at any place. The cover extends suitably at least approximately as far as a connection for entry of the active agent into an oscillating tube of the resonator whereby complete protecresonator is preferably widened and the front and/or rear portion of the cover which merges into such widened portion of the cover is of conical or like form, so that favorable flow properties result.

The air blast from the blower in the sprayingyapparatus may also be used advantageously for the production of mist and for the delivery of mist, by exchangeably connecting a supply air nozzle of the oscillating burner resonator to the blower, the supply air nozzle being directed suitably to the oscillating tube of the resonator, and lying in its area. Thereby supply air emerging from the nozzle carries along mist produced in the oscillating burner resonator so that a very large range of mist delivery can be obtained.

Preferably the supply air nozzle is arranged axially parallel to and around the oscillating tube, so that the supply air current forms an air covering surrounding the mist current so as to.cause the mist current to be bunched together so that it canpenetrate the atmosphere more easily and thus can be delivered over a greater distance.

The supply air nozzle is suitably formed by the front end 'of a cover and preferably this cover is provided by the cooling cover so that a separate air nozzleanda separate supply air connection are not necessary and an extremely simple arrangement can be obtained.

For obtaining optimum bunching together of the mist current the nozzle or the cover is cylindrical.

In a further embodiment of the invention, the oscillating tube terminates in frontofthe supply air nozzle and has an end section which is widened so that a twistfree, cooled, oscillating air current from the resonator is widened in cross-section, and upon leaving this widened section is stabilized. In addition, withthis arrangeened, so that a loosened mist field results and bunching together of the mist droplets is prevented. Thus optimum use of the active agent which may be expensive is ensured. This is in particular the case when the widened section of the oscillating tube is of a form having parallel surface lines, for example, a cylindrical form. The widened section of the oscillating tube preferably merges with the remainder of the tube via a section of conical or like form in front of the supply air nozzle to give favorable flow conditions.

Preferably entry of the active agent into the oscillating tube occurs at a position behind the widened oscillating tube section and in front of the end of the supply air nozzle, preferably approximately centrally between these.

In order to improve operation of the oscillating .burner resonator, the oscillating burner resonator may have a carburetor which is-provided with an air pipe,

leading into a fuel whirling chamber which is connected to the blower. With this arrangement there is no need for a pumpp for the operation ofthe oscillating burner resonator, which may be complicated and liable to failure, since fuel supply pressure for starting the burner is produced by the blower. In a particularly suitable arrangement the air pipe extends into the cooling air current, preferably between the cooling cover and the blower side of the heat protection cover, so that the kinetic and static energy of the blower can be utilized to produce compressed air to start theresonator. In addition, to accomodate the air pipe, in a space saving manner, the axes of the air pipe, a mixing neck of the carburetor and the resonator may lie in a plane preferably a perpendicular plane.

The carburetor may have an integral carburetor valve chamber, in particular formed as a casting to give a simple construction.

Preferably the valve chamber of the carburetor is axially parallel to its mixing neck, tothe carburetor, and also to the oscillating burner resonator whereby a simple construction is obtained giving rise to a saving of pipes and inexpensive manufacture.

A twisting member lying solely in the mixing neck may be provided, in particular at a distance from a fuel nozzle and preferably fixed to a flange of the carburetor. Thereby, such member can be [kept short in its constructional length while being effective in the mixture preparation zone of the carburetor.

The fuel nozzle of the carburetor is suitably provided cross-wise to the direction of flow, preferably in the region of the middle of the fuel whirling chamber, to give a very satisfactory preparation of thefuel mixture.

In order to prevent an accumulation of excess fuel in the carburetor ina structurally simple'manner, a combined return pressure pipe from the fuel whirling chamher to the fuel tank may be provided approximately axially parallel to the mixing neck of the carburetor.

All pipes of the carburetor may be connected to the same side of the carburetor, preferably in a protected position on the rear side, in an easily visible manner as well'as in a spatially close arrangement. For the accorn modation of the carburetor ina space saving manner, such pipes may be provided on the upper side of the oscillator burner resonator and of the cooling cover surrounding this, whereby the carburetor is also easily accessible, for example, for the purpose of starting the oscillating burner resonator. It is particularly advantageous if the carburetor has a cubic outer shape, whereby additional parts or units can be advantageously mounted on the carburetor.

In order to prevent overheating of the resonator in the event of failure of the blower, an adjusting device may be provided on the fuel supply to the oscillating burner resonator, preferably on the carburetor, which can be controlled independently of the blower pressure so that in the event that blower pressure falls, the fuel supply is immediately interrupted and thereby the resonator is stopped. The adjusting device is fonned suitably by means of a discharge valve, preferably diaphragm controlled, on the fuel whirling chamber whereby a very rapid shutting off of the fuel supply to the resonator is ensured. The valve closing member may be disposed in a simple manner in a cover of the carburetor housing, which cover forms with the diaphragm, a pressure chamber, and on the side of the diaphragm facing away from the carburetor, there is provided a cover cap provided with discharge openings as a protection.

Preferably, the active agent pipe is connectable to the blower so that the active agent pipe can be completely cleaned in a simple manner with compressed air. In order to be able to effect such connection simply and selectively when required, the active agent pipe may be connected to an outlet connection of a valve, preferably a three-way valve, an inlet connection of which is connected by means of a pipe to the blower. The three-way valve may, in a simple manner, be provided as an intermediate piece between the ends of the active agent pipe, whereby by suitable operation of the valve, compressed air from the blower can be fed at the same time, or separately, to both sections of the active agent pipe. In a particularly simple embodiment the active agent pipe is connectable to the cooling apparatus of the oscillating burner resonator, and the valve is fixed directly on the cooling cover, whereby a separate blower supply pipe to the valve is not necessary. In order to achieve a comparatively large air presssure in the active agent pipe, the inlet connection of the valve may be associated with a pressure member, preferably a pressure plate.

In order to enable the active agent supply to be adjusted at any time as required, a manually operable valve may be provided in the active agent pipe, which in a simple manner may be provided by the aforesaid three-way valve.

In order to prevent the active agent fromm flowing unobstructed into the oscillating pipe, where it may possibly become ignited when the burner is stopped, a control valve may be provided in the active agent pipe, preferably in the region of the connection of the active agent pipe to the oscillating burner resonator, which valve is operable by resonator pressure so that with low pressure in the oscillating burner resonator the valve closes and immediately adjusts the active agent supply, whereby if the valve is provided directly adjacent to the region of connection of the active agent pipe, it is attained that after the closing of the valve, no or very little active agent flows into the oscillating pipe ln a simple embodiment, the control member of the valve is formed by a diaphragm, which is connected on its pres sure side by means of a pipe to the combustion chamber of the oscillating burner resonator, so as to respond immediately to a change in combustion chamberpressure. So that the valve may have two operating positions, namely a completely open and a completely closed position, without intermediate positions, the valve has a closing part which is urged to a position at which the valve is closed, and a spring loaded stop member is provided which, when the valve is in the open position, contacts a stop of the closing part of the valve and is movable preferably cross-wise to this, so that by releasing the stop member, the valve closing part is moved abruptly into its closed position, but when the combustion chamber is under pressure completely free passage for the active agent is ensured.

For facilitating handling of the spraying apparatus the oscillating burner resonator is in the form of a rod so that it can be conveniently held and can be directed as desired by manual engagement of the cooling cover. Loosening of the mist producing additional apparatus which may be necessary, for example, when using on uneven terrain, may be achieved by connecting the oscillating burner resonator tube by means of at least one tear-off coupling or the like to the spraying apparatus so that by application only of a traction force or by similar simple handling, separation of the oscillating burner resonator from the spraying apparatus can be attained. In a simple construction the cooling apparatus of the oscillating burner resonator is connected by means of a plug coupling which has preferably a resilient suspension clip or the like, to the blower pressure connection piece formed in particular by means of a flexible hose, so that the cooling apparatus is held only -by frictional connection to the blower connection piece. If the active agent container is disposed fixed to the apparatus, then it may be necessary for the active agent pipe which leads from the active agent container tothe active agent inlet in the oscillating burner resonator, to be provided with a tear-off coupling, which preferably on the container side has a safety valve which closes when the coupling is released, so that immediately after release of the tear-off coupling, further discharge of active agent from the active agent container is prevented. In a simple construction the tearoff coupling of the active agent pipe is fixed directly on v The combustion chamber of the oscillating burner.

resonator may be surrounded by a heat protection means formed preferably by a cover. Thereby the whole heat of the combustion chamber of the oscillating burner resonator may be radiated onto the heat protection cover from where the heat is dissipated convectively by the cooling air. The protection cover ensures that the combustion chamber has a constant temperature, preferably between 800 and 1000 C, so that uniform running behavior of the combustion chamber is ensured. Furthermore, with this arrangement the temperature of the cooling cover or cooling tube 'is kept low so that the rod-like bu'rner resonator may also be held in this area by hand, without additional heat protection being necessary. The heat protection cover may be conical or of a similarly tapered form suitably at the blower side end, and is preferably closed, so that with favorable blow conditions complete protection of the combustion chamber in respect of the blast air current is ensured. On the front end the heat protection cover may be open so that a small release of air is ensured.

The oscillating burner resonator may have an ignition device which is connectable to the electric circuit, in particular the ignition'circuit, of the blower motor, so that a separate unit for the ignition current of the oscillator burner resonator is not necessary. Instead of this or additionally however, it is also feasible to dispose in an easily detachable manner on the oscillating burner resonator, preferably below the combustion chamber, an electric starting device for the oscillating burner resonator, which, for example, may comprise an ignition coil and dry batteries.

A further constructional simplification of the apparatus is attained by providing a fuel tank for the oscillating burner resonator which forms a constructional part at least with one part of the cooling apparatus, and which is preferably disposed in an easily detachable manner on the oscillating burner resonator. Suitably a section, preferably the rear transition section of the widened part of thee oscillating burner resonator is connected to the fuel tank and passes therethrough. This construction also facilitates favorable arrangement of a filling connection for the fuel tank.

One embodiment of the invention will now be described by way of example only with reference to the accompanying drawings which are approximately true to scale and in which:

FIG. 1 is an axial sectional view of one form of spraying apparatus according to the invention;

FIG. 2 isa sectional view of the spraying apparatus of FIG. 1 on an enlarged scale;

FIG. 3 is a vertical sectional view of the carburetor of the apparatus of FIGS. 1 and 2,

FIG. 4 is a horizontal sectional view of the carburetor of FIG. 3;

FIGS. 5 and 6 are partially sectional views of the apparatus of FIG. 1 on an enlarged scale;

FIG. 7 is a cross-sectional view of the active agent inlet of the apparatus of FIG. 1; and

FIG. 8 is a sectional view of a detail of the apparatus of FIG. 1 enlarged.

As shown in FIGS. 1 and 2, the spraying apparatus has a multi-blower unit 1, which is formed by a combustion engine 2 connected to a radial blower 3, which has a downwardly projecting connection piece 4 for connection to a blower pressure connection piece 5.

- To the blower pressure connection piece 5 there is connected a cooling apparatus 7, for an oscillating burner resonator 6. The cooling apparatus is formed by a tube-like cover 7, in which a combustion chamber 8 and an oscillating tube 9 of the oscillating burner resonator are disposed. In the region of the combustion chamber 8, the cooling cover 7 has a cylindrical section 10, of enlarged diameter, which merges via conical end sections II and 12 into connecting sections of the cooling cover 7. A front section 13 of the cooling. cover 7 is disposed coaxially around the oscillating pipe 9, and is open at its front end 14, was to define an annular air nozzle 14 directed in the axial direction of the pipe 9. Directly in front of this nozzle 14 an active agent inlet connection piece 15 which is connected with an active agent pipe 16 to an active agent tank 17, leads into the tube 9. The active agent tank is fixed on the upper side of the blower 3. The pipe 9 is of constant cross-section over its whole length except in front of the active agent inlet connection piece 15 where it has a widened section 17, the inner dimension of which is about the same as that of the front section 13 of the cooling cover 7, and which merges with the remainder of the pipe 9 via a conical transition section 18.

Above the combustion chamber 8 of the oscillating burner 6, there is provided a carburetor 19 outside the cooling cover 7, which carburetor 19 is connected via a suction pipe 20 to the rear end of the burner 8.

Fuel air mixture is delivered from the carburetor 19 through the suction pipe 20 into the combustion chamber 8 and is ignited in the combustion chamber with means, not shown,- giving rise to frequent explosions or detonations in the combustion chamber 8, which produce in theoscillating pipe 9 gas column oscillations which are superimposed on pressure waves the amplitudes of which are determined mainly by the geometrical structure of the oscillating tube. Thereby successive high pressure and low pressure zones are produced in the tubes 8 and 9, the maximum and minimum value of the pressure differing quite considerably from atmospheric pressure. Gases flow forward in the oscillation tube 9 in the direction of the arrow 21, and liquid active agent is introduced through the connection piece 15 into such flow, such active agent being immediately broken up into fine droplets by the oscillating gas column, being partially evaporated in consequence of the gas temperature, and together with the exhaust gas being expelled as mist from the end 22 of the oscillating tube 9. At the same time, operation of the blower 3 causes the combustion chamber 8 and the oscillating tube 9 to be cooled by an air current surrounding these, which air current emerges heated from the nozzle 14. The heated air current emerging from the nozzle 14 is widened to give an air current covering on the widened end section 17,. and is stabilized upon leaving theend edge 22 of the tube 9, so as to provide an air covering surrounding the mist current emerging from the tube 9 which prevents such mist current immediately upon leaving the oscillating tube 9, from widening substantially in cross-section. Such mist current protected by the air covering can be driven into the atmosphere over a large distance until the effect of the air cover reduces sufficiently to enable the mist current to widen out. As the mist current passes from the oscillating tube 9 into the widened end section 17, the mist current crosssection increases so that individual mist droplets are not caused to be bunched together, so as to give an extremely fine distribution of mist droplets.

As is also shown in FIGS. 1 and 2, the combustion chamber 8, which in its rear region has a cylindrical, and in its front region a conical section, is provided with a heat protection cover 23 which is located around the chamber 8 and inside the cooling cover 7. The radial distance of the cover 23 from the periphery of the combustion chamber 8 is about the same over its whole extension: The rear end 24 of theheat protection covering 23 lying'behind the rear end of the combustion chamber 8 is in the form of a closed conical section while the front end 25 is open. The distance of the heat protection cover 23 from the widened sectionlt) of the cooling cover 7 is selected so large as to give a sufficient annular space for passage of blower air. By means of the heat protection cover 23 the temperature of the burner 8 can be kept constant, and furthermore, insulates the burner from the cooling cover 7 so that this cover 7 can be gripped by hand in the region of the widened section 10. The suction tube 20 which passes radi ally through the cooling cover 7 and the heat protection cover 23, at the rear end of the burner 8, firmly holds the tubes 8, 9 as well as the heat protection cover 23, axially in respect of the cooling cover 7, so that the former upon heating may expand unobstructed forwards in the direction of the arrow 21.

Between the rear end 24 of the heat protection cover .23 and the surrounding rear section 11 of the cooling cover 7, there is formed an annular channel which tapers in cross section forward in the direction of the arrow 21. In such channel, pointing to the rear, there is disposed the end of a starting air pipe 26, which pipe is guided on the cooling cover 7 to the rear 27 of the carburetor 19. With this arrangement, during operation of the blower 3, in a manner still to be described, air is forced into the carburetor 19.

The rear transition section 11 of the widened part of the cooling cover 7 is formed as an independent constructional part, fixed detachably with screws 28, which forms a constructional unit with a fuel tank 29 for the oscillating burner resonator 6. In the embodiment illustrated the section 11 passes through the fuel tank 29 so that a filling connection piece 30 of the tank lies above the transition section 11, and the main part of the tank 29 is located below the transition section 11..To the rear 27 of the carburetor 19, a combined return pressure pipe 31 is connected, which is guided from the carburetor 19 to the rear to the upper part of the fuel tank 29, so that excess fuel can be returned continuously from the carburetor 19 to the tank 29.

A housing 32 is fixed under the cover 7 to the front side of the fuel tank 29, in an easily detachable manner (not shown) such housing 32 supporting an ignition coil 33 and dry batteries 34, for ignition of fuel mixture in the combustion chamber 8.

As shown in FIGS. 2 and 3, the return pressure pipe 31, the suction tube 20, and the starting air pipe 26 run substantially axially parallel to one another from the rear 27 of the carburetor 19, and their middle axes lie with the middle axis of the oscillating burner resonator 6 in a common vertical plane. The suction tube is connected to the carburetor 19 between the starting air pipe 26, which lies above it, and the return pressure pipe 31, and the return pressure pipe 31 passes axially parallel to the oscillating burner resonator 6, directly above the cooling cover 7 as far as the fuel tank 29.

The carburetor 19 has a substantially cubic housing 35 which is cast in one piece with a valve chamber 36. The valve chamber 36 is substantially cylindrical, passes through the housing 35 and is surrounded by a fuel whirling chamber 37 formed in the housing 35 which is connected to the valve chamber 36 via at least one fuel nozzle 38 lying in the region of the middle of its length. The axis of the fuel nozzle 38 lies horizontally and at right angles to thee axis of the carburetor which is identical with the axis of the valve chamber 36.

At the rear 27 of the carburetor l9 and end 39 of the suction tube 20 which defines a mixing neck is introduced into the valve chamber 36 so that this mixing neck 39 lies on the axis of the carburetor and the valve chamber 36. The mixing neck 39 isclamped against the carburetor 35 by an annular disc-like flange 40, and is thereby axially secured. Inside the mixing neck 39 there is located a twisting member 41 which is fixed to the front end of the mixing neck 39 lying in the valve chamber 36, by means of holders 42' on its front end. The member 41 freely projects from the front end to the rear in the mixing neck 39. The whole twisting body 41 is located at a distance behind the fuel nozzle 38 so that in the area of the air and fuel intake there is produced a free tubular cross-section, and the twisting body 41 only acts in the mixture preparation zone, that is, the mixing which takes place with the smallest possible drop in pressure. A starter switch 42 is mounted on the upper side of the cubic carburetor housing 35.

To start the oscillating burner resonator the blower 3 is set in operation so that the fuel whirling chamber 37 is pressurized via the starting air pipe 26, and fuel is supplied to the fuel whirling chamber 37 from the tank 29 through the nozzle 38, and the tube 20 to the burner 8. On operation of the starting switch 42, the fuel air mixture in the burner 8 is ignited. During subsequent operation air is drawn into the valve chamber 36 through a suction valve 43 provided on the front side of the carburetor 19 and is mixed with fuel from the nozzle 38. Subsequently, in the area of the twisting member 41, a mixing preparation takes place to give a prepared mixture corresponding to the working frequency of the burner 8.

As shown in FIG. 4, one side wall of the carburetor 19 is formed by a lid 44, which carries an adjusting device 45 for the oscillating burner resonator 6. This device comprises an air evacuating valve 46, associated with the fuel whirling chamber 37, which has a valve closing part 47 which is movably mounted in the lid 44 at right angles to the axis of the carburetor, and which is tensioned by a spring 48 in the direction of the axis of the carburetor. The valve closing part 47 is provided with a blind end bore leading to the outside of the lid 44 and has cross-bores 47a leading into this blind bore which in the end position of the valve closing part 47, directed towards the axis of the carburetor, communicates with the fuel whirling chamber 37, and in the other end position, to the slide bore of the lid 44 in which the valve closing part 47 is movable, they are closed. A diaphragm 49 is sealed at its edges to the outside of the lid 44, the middle area of the diaphragm 49 being connected to the valve closing part 47. A pressure space 50 is enclosed by the lid 44 and the diaphragm 49 and communicates with a control pressure pipe 51 which is provided as a by-pass from the starting air pipe 26, so that the space 50 is kept under pressure by the blower 3. Due to this pressure the diaphragm is raised from the lid 44 to the position shown on the right in FIG. 4, so that the bores 47a of the valve closing part 47 are closed. If, on the other hand, due to defects in the blower 3 the blower pressure drops, then the space 50 becomes depressurized, so that the valve closing part 47 is moved by the spring 48 into the position shown on the left in FIG. 4, and the fuel mixture is led through the bores 47a and the blind hole bore from the fuel whirling chamber 37, so that an immediate stopping of the burner 8 is effected. On the outside of the lid 44 a cover cap 52 is fixed, which is provided with air evacuation bores 53. On the opposite side of the carburetor a similar cap-like lid 53 is provided.

As shown in FIG. 5, the blower pressure connection piece 5 is formed as a flexible hose'which is pushed onto the outlet connection piece 4 of the blower, and is firmly clamped in place with a screw clamp 54. The cylindrical end connection piece 35 of the cooling cover 7 which connects with the conical transition section 1 l is pushed into the other end of the flexible hose 5 and is fixed with a tear-off coupling 56 so that it can be separated from the hose by a predetermined tractive stress. The break-off coupling 56 has a clip-like, clamping band 57 which presses the hose 5 against the periphery of the closure connection piece 55, the ends of the clamping band 57 being connected to one another by means of a traction spring 58, the spring strength of which determines the braking force of the coupling 56.

So that separation of the cooling cover 7 and thereby the oscillating burner resonator 6 from the spray apparatus will ensure also separation of the active agent pipe 16, there is also detachably inserted in the outlet connection piece 59 of the active agent tank 17 a break-off coupling 60. The break-off coupling 60 has on the tank side end a collar sleeve 61 which can be inserted and frictionally locked in the connection piece 59, and can be mounted and dismantled without a tool. A sleeve 62 is provided on the inner end of the sleeve 61. On the outer end section 63 of the sleeve 61, which is of reduced diameter, a valve housing 64 is placed which clamps a guide plate 65 against the front-side of the end-section 63. On the free end of the valve housing 64, there is provided a plug opening 66, which tapers conically inwards, in which the corresponding protected end 67 of the active agent pipe 16 can be inserted and frictionally locked, so that the end 67 can be separated from the housing 64 by a predetermined traction force on the pipe 16. A valve closing part 68 with a shaft is guided movably in the plate 65 and this conicalvalve closing part 68 is spring-loaded in a direction towards the opening 66 by means of a helical coil spring. The inner end of the opening 66 provides a valve seating for the valve closing part 64. If the hose, as shown on the right of FIG. 6, is inserted into the vlave housing 64, then the valve closing part 68 is pressed back against the force of the spring so that the valve is opened, and the active agent can flow from the tank 17 into the pipe 16. As soon as the hose 16, as shown on the left in FIG. 6, is withdrawn from the opening 66, the valve closing part 68 moves against its seating, whereby further flow of active agent from the tank 17 is prevented.

Directly above the active agent inlet connectionpiece 16, there is provided a shut-off valve 69 (FIG. 7), in the path of the active agent. This valve 59 is, viewed from above, screwed onto the active agent inlet connection piece 15, and has a valve pin 70, axially parallel to this, which is spring-loaded downward against a valve seating by a spring 71. Above the valve seating there is provided-on the pin 70 a stop collar 72, which is associated with a catch bolt 73 disposed movably at right angles thereto. This catch bolt 73 is spring-loaded away from the valve pin 70 by a screw-pressure spring 74 and is fixed on a diaphragm 76 of a pressure valve 75. The valve 75 has a chamber77facing away from the pin 70 which is connected via a pipe (not shown) to the combustion chamber 8, and the oscillating tube 9. Due to the combustion chamber pressure'prevailing in the chamber 77, the catch bolt 73 is held against the force of the spring 74 in the position indicated on the right in FIG. 7, at which it contacts the stop-collar 72 so that the valve pin 70 is located in its open position at which active agent can flow through connection 78 into the connection piece 15. As soon as the pressure in the chamber 77 drops below a predetermined value,

for example, due to a defect of the oscillating burner resonator 6, the catch bolt 73 is drawn back by the spring 74, from the stop-collar 72, so that the pin 70 under the force of the spring 71, as shown on the left in FIG. 7, is moved into its closed position, and further flow of active agent to the connection piece 15 is prevented. The pin 70 projects upward from the valve 69, so as to provide a handle 79 with which the valve may again be opened.

In the active agent pipe 16 there is provided, as shown in FIG. 8, a three-way valve 80, having two axially aligned outlet connection pieces 81, 82 connected respectively to a section 160 of the active agent pipe leading to the active agent tank 17, and to a section 16b of the active agent pipe leading to the connection piece 15. The valve 80 has a housing 83 which is fixed with a flange to the outside of the cooling cover 7, for example, on its upper side, and an inlet connection piece 84 of the valve 80 is directly connected to the cooling cover 7. In the area of the inlet opening 84, there is provided in the cooling cover 7, a pressure plate 85 inclined obliquely in the direction of the cooling air flow, by means of which a part of the cooling air current can be diverted into the three-way valve 80. The valve has a control part 86, which is operated by a handle 87, and

.in the position of this part according to FIG. 8, air is directedthrough the valve inlet 84 into the section 16b of the active agent pipe leading to the active agent inlet connection piece 15, so that this is cleaned to remove, for example, deposited, and possibly dry effective agent particles, with, if necessary, hot air without using additions in the cleaning air which may or further soil the active agent pipe. If the handle 87 is pivoted to the left from the position shown in'FIG. 8, then the two active agent pipe sections 16a, 16b are connected to one another to allow passage of the active agent. If on the other hand the handle 87 is pivoted to the'right from the position according to FIG. 8, then the section 16b of the active agent pipe is connected to the cooling air cover 7, so that both sections can be cleaned with blower air.

It is, of course, to be understood that the present invention is, by no means, limited to the specific showing in the drawings, but also comprises any modifications within the scope of the appended claims.

What we claim is:

1. A spraying apparatus, which includes a delivery pipe, a motor driven blower connected to said delivery pipe, an active agent receiving tank connected to said delivery pipe and an oscillating burner resonator having cooling means and being exchangeably connected to said blower for generating mist, carburetor means associated with said oscillating burner resonator and exchangeably connected to the blower, and comprising a whirling chamber and starter air pipe means leading to said whirling chamber,,said starter air pipe means projecting as a pressure pipe into the cooling air current for the oscillating burner resonator, said carbure? tor means also comprising a mixture neck, the axes of said starter air pipe means and of said mixing neck and of said burner resonator lying parallel to oneanother in a plane.

2. An apparatus according to claim 1, in which the carburetor means of said resonator forms one single cast piece with a valve chamber of said carburetor, said valve chamber being axially parallel to said mixing neck.

3. An apparatus according to claim 1, in which said carburetor means has a flange and includes a twisting member located entirely within the mixing neck of the carburetor in spaced relationship to a fuel nozzle of said carburetor and fixed to said carburetor flange.

4. An apparatus according to claim 1, in which the carburetor means of said resonator has a fuel nozzle arranged transverse to the carburetor flow direction in the middle region of said whirling chamber, and which includes a fuel tank and a return pressure pipe leading connected to said blower, and said outlet connection being connected to said pipe means for conveying an from the carburetor to the fuel tank, said pressure pipe being approximately axially parallel to the mixing neck of the carburetor, all pipes of said burner resonator being connected to the same side of the carburetor.

5. An apparatus according to claim 1, which includes a cooling jacket surrounding said resonator, and in which said carburetor means is provided on the upper side of said cooling jacket.

6. An apparatus according to claim 1, in which the carburetor means of said resonator has a cubicle outer shape.

7. An apparatus according to claim 1, which includes an adjusting device responsive to blower pressure and arranged in the fuel supply to said resonator.

8. An apparatus according to claim 7, in which said adjusting device is formed'by a diaphragm controlled relief valve on said fuel whirling chamber.

9. An apparatus according to claim 8, in which the valve has a valve closing part forming with the diaphragm a diaphragm pressure chamber, and a cover cap having air evacuation openings and being located on that side of the diaphragm which faces away from the axis of the carburetor.

10. An apparatus according to claim 1, which includes an adjusting device responsive to blower pressure and arranged in the fuel supply to said resonator,

said adjusting device being connected to a section of 13. An apparatus according to claim 12, which includes a three-way valve having an inlet connection and an outlet connection, said inlet connection being active agent.

14. An apparatus according to claim 5, which includes pipe means for conveying an active agent, and in which said pipe means is connected to said cooling jacket, a manually operable three-way valve having inlet and outlet connections being directly located to the cooling jacket.

15; An apparatus according to claim 14, in which the inlet connection of said three-way valve has a pressure plate associated therewith, and which includes a resonator pressure responsive valve closed in response to said resonator being pressureless, said resonator pressure responsive valve being located in the pipe means for conveying an active agent.

16. An apparatus according to claim 1, in which said resonator has the shape of a rod.

17. An apparatus according to claim 1, which includes a break-off coupling, and in which said resonator is detachably connected to said spraying apparatus by at least one break-off coupling, said spraying apparatus also including a cooling jacket surrounding said resonator and furthermore includes a plug coupling, said cooling jacket being connected through said plug coupling to said blower.

18. An apparatus according to claim 12, in which the pipe means for conveying an active agent leads from the active agent receiving tank to said resonator and in which a break-off coupling is provided associated with said active agent conveying pipe means, safety valve means being associated with said break-off coupling and being adapted to close in response to a disengagement of said coupling.

19. An apparatus according to claim 1, which includes electric starting means for said resonator, said electric starting means being detachably connected to said resonator.

20. An apparatus according to claim 4, which includes a cooling jacket surrounding said resonator and in which the fuel tank forms a structural unit with at least a portion of said fuel tank, which portion is detachably connected to said resonator, said cooling jacket having a portion connected to said fuel tank. 

1. A spraying apparatus, which includes a delivery pipe, a motor driven blower connected to said delivery pipe, an active agent receiving tank connected to said delivery pipe and an oscillating burner resonator having cooling means and being exchangeably connected to said blower for generating mist, carburetor means associated with said oscillating burner resonator and exchangeably connected to the blower, and comprising a whirling chamber and starter air pipe means leading to said whirling chamber, said starter air pipe means projecting as a pressure pipe into the cooling air current for the osCillating burner resonator, said carburetor means also comprising a mixture neck, the axes of said starter air pipe means and of said mixing neck and of said burner resonator lying parallel to one another in a plane.
 2. An apparatus according to claim 1, in which the carburetor means of said resonator forms one single cast piece with a valve chamber of said carburetor, said valve chamber being axially parallel to said mixing neck.
 3. An apparatus according to claim 1, in which said carburetor means has a flange and includes a twisting member located entirely within the mixing neck of the carburetor in spaced relationship to a fuel nozzle of said carburetor and fixed to said carburetor flange.
 4. An apparatus according to claim 1, in which the carburetor means of said resonator has a fuel nozzle arranged transverse to the carburetor flow direction in the middle region of said whirling chamber, and which includes a fuel tank and a return pressure pipe leading from the carburetor to the fuel tank, said pressure pipe being approximately axially parallel to the mixing neck of the carburetor, all pipes of said burner resonator being connected to the same side of the carburetor.
 5. An apparatus according to claim 1, which includes a cooling jacket surrounding said resonator, and in which said carburetor means is provided on the upper side of said cooling jacket.
 6. An apparatus according to claim 1, in which the carburetor means of said resonator has a cubicle outer shape.
 7. An apparatus according to claim 1, which includes an adjusting device responsive to blower pressure and arranged in the fuel supply to said resonator.
 8. An apparatus according to claim 7, in which said adjusting device is formed by a diaphragm controlled relief valve on said fuel whirling chamber.
 9. An apparatus according to claim 8, in which the valve has a valve closing part forming with the diaphragm a diaphragm pressure chamber, and a cover cap having air evacuation openings and being located on that side of the diaphragm which faces away from the axis of the carburetor.
 10. An apparatus according to claim 1, which includes an adjusting device responsive to blower pressure and arranged in the fuel supply to said resonator, said adjusting device being connected to a section of said starting air pipe means.
 11. An apparatus according to claim 7, in which the adjusting device is adjustable in conformity with its release pressure.
 12. An apparatus according to claim 1, which includes pipe means for conveying an active agent, and in which at least a part of said pipe means is connectable to said blower.
 13. An apparatus according to claim 12, which includes a three-way valve having an inlet connection and an outlet connection, said inlet connection being connected to said blower, and said outlet connection being connected to said pipe means for conveying an active agent.
 14. An apparatus according to claim 5, which includes pipe means for conveying an active agent, and in which said pipe means is connected to said cooling jacket, a manually operable three-way valve having inlet and outlet connections being directly located to the cooling jacket.
 15. An apparatus according to claim 14, in which the inlet connection of said three-way valve has a pressure plate associated therewith, and which includes a resonator pressure responsive valve closed in response to said resonator being pressureless, said resonator pressure responsive valve being located in the pipe means for conveying an active agent.
 16. An apparatus according to claim 1, in which said resonator has the shape of a rod.
 17. An apparatus according to claim 1, which includes a break-off coupling, and in which said resonator is detachably connected to said spraying apparatus by at least one break-off coupling, said spraying apparatus also including a cooling jacket surrounding said resonator and furthermore includes a plug coupling, said cooling jacket being connected through said plug coupling tO said blower.
 18. An apparatus according to claim 12, in which the pipe means for conveying an active agent leads from the active agent receiving tank to said resonator and in which a break-off coupling is provided associated with said active agent conveying pipe means, safety valve means being associated with said break-off coupling and being adapted to close in response to a disengagement of said coupling.
 19. An apparatus according to claim 1, which includes electric starting means for said resonator, said electric starting means being detachably connected to said resonator.
 20. An apparatus according to claim 4, which includes a cooling jacket surrounding said resonator and in which the fuel tank forms a structural unit with at least a portion of said fuel tank, which portion is detachably connected to said resonator, said cooling jacket having a portion connected to said fuel tank. 